Alpha Fade Flicker

[jamesfrize]

I'm tryin' to make an applet that displays a slowly fading image against a white background. It works ish, it's just a bit pants! The background is all grey and it flickers like a bugger. I'm used to using the Toolkit which automatically handles all the Image stuff for me.
I've added an HTML file to run the main class, Unfortunately the images were 2 big to upload here.

Code:

import java.awt.*;
import java.awt.image.*;
import javax.swing.*;
import static java.lang.Thread.*;
import java.applet.*; 
import java.awt.event.*;
import java.net.*;

public class index extends JApplet 
{
String file = "opened.wav";
Image source;
MediaTracker mt;

    public void init()
    {
        mt = new MediaTracker(this);
        source = getImage(getCodeBase(), "rico.jpg");
        mt.addImage(source,1);
    
        try
        {
            mt.waitForAll();      
        }
            catch(Exception e)
        {
            System.out.println("read error: " + e.getMessage());
        }
            
        setBounds (0,0,300,325);
        Container c = getContentPane();
        Image3screen thescreen = new Image3screen(source);
        c.setLayout(new BorderLayout());
        c.add(thescreen, BorderLayout.CENTER);
        
         addMouseListener
          (
              new MouseAdapter()
              {
              public void mousePressed(MouseEvent me)
              {
              AudioClip ac = getAudioClip(getCodeBase(), file);
              ac.play();

                      try
                      { 
                      AppletContext a = getAppletContext();                    
                      URL u = new URL("http://jamesfrize.43host.info/sonodrome.html");
                      a.showDocument(u,"_self");
                      }
                      catch (Exception e) 
                      {
                      System.out.println("read error: " + e.getMessage());
                      }
              }
              }
          );
    }
}

class Image3screen extends JPanel implements Runnable
{
    int alphaLevel = 0;
    int alphaInc = 5;
    AlphaFilter af;
    Thread thread;
    boolean filtering = false;
    Image source, result;
    
    public Image3screen(Image sourceImage)
    {     
        source = sourceImage;
        result = source;
        alphaLevel = alphaInc;
        start();
    }

    private void start()
    {
        if(!filtering)
        {
            filtering = true;
            thread = new Thread(this);
            thread.setPriority(NORM_PRIORITY);
            thread.start();
        }
    }

    public void run()
    {
        while(filtering)
        {
            try
            {
                sleep(50);
            }
            catch (InterruptedException ex)
            {
                System.out.println("interrupted");
                filtering = false;
            }

            alphaLevel += alphaInc;
            if(alphaLevel < 5 || alphaLevel > 250)
            alphaInc *= -1;

            filterImage();
            repaint();
        }
    } 

    private void filterImage() 
    { 
        result = createImage(new FilteredImageSource(source.getSource(),
        new AlphaFilter(alphaLevel)));
    }

    public void paintComponent(Graphics g) 
    {
        g.setColor(Color.white);
        g.fillRect(0,0,300,300);
        g.drawImage(result,0,0,this);
    } 
}

class AlphaFilter extends RGBImageFilter 
{
    int alphaLevel;

    public AlphaFilter(int alpha) 
    {
        alphaLevel = alpha;
        canFilterIndexColorModel = true;
    }

    public int filterRGB(int x, int y, int rgb) 
    {
        int alpha = (rgb >> 24) & 0xff;
        alpha = (alpha * alphaLevel) / 255;

        return ((rgb & 0x00ffffff) | (alpha << 24));
    } 
}

Cheers, :{p

[jamesfrize]

Anyone have any clues?? I'm used to Java automatically handling the Image Buffering, I use the swing toolkit. I've not as yet had to double buffer anything. Is this one of the cases where it would be needed?

[hardwired]

Code:

//  <applet code="FadeTest" width="300" height="300"></applet>

import java.awt.*;
import java.awt.image.*;
import javax.swing.*;
import static java.lang.Thread.*;
import java.applet.*; 
import java.awt.event.*;
import java.net.*;

public class FadeTest extends JApplet 
{
    String file = "opened.wav";
    Image source;
    MediaTracker mt;

    public void init()
    {
        mt = new MediaTracker(this);
        source = getImage(getCodeBase(), "rico.jpg");
                                         //"images/blackBear.jpg");
        mt.addImage(source,1);
    
        try
        {
            mt.waitForAll();      
        }
            catch(Exception e)
        {
            System.out.println("read error: " + e.getMessage());
        }
            
        setBounds (0,0,300,325);
        Container c = getContentPane();
        ImageScreen2 thescreen = new ImageScreen2(source);
        c.setLayout(new BorderLayout());
        c.add(thescreen, BorderLayout.CENTER);
        
        addMouseListener(new MouseAdapter()
        {
            public void mousePressed(MouseEvent me)
            {
                AudioClip ac = getAudioClip(getCodeBase(), file);
                ac.play();

                try
                { 
                    AppletContext a = getAppletContext();                    
                    URL u = new URL("http://jamesfrize.43host.info/" +
                                    "sonodrome.html");
                    a.showDocument(u,"_self");
                }
                catch (Exception e) 
                {
                    System.out.println("read error: " + e.getMessage());
                }
            }
        });
    }
}

class ImageScreen2 extends JPanel implements Runnable
{
    Thread thread;
    boolean filtering = false;
    Image source;
    int rule = AlphaComposite.SRC_OVER;
    float alpha = 0;
    float alphaInc = 0.01f;
    
    public ImageScreen2(Image sourceImage)
    {     
        source = sourceImage;
        start();
    }

    private void start()
    {
        if(!filtering)
        {
            filtering = true;
            thread = new Thread(this);
            thread.setPriority(NORM_PRIORITY);
            thread.start();
        }
    }

    public void run()
    {
        while(filtering)
        {
            try
            {
                sleep(100);
            }
            catch (InterruptedException ex)
            {
                System.out.println("interrupted");
                filtering = false;
            }

            alpha += alphaInc;
            if(alpha < 0.01f || alpha > 0.99f)
            alphaInc *= -1;

            repaint();
        }
    }

    protected void paintComponent(Graphics g) 
    {
//        g.setColor(Color.white);
//        g.fillRect(0,0,300,300);
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        Composite orig = g2.getComposite();
        AlphaComposite ac = AlphaComposite.getInstance(rule, alpha);
        g2.setComposite(ac);
        g2.drawImage(source,0,0,this);
        g2.setComposite(orig);
    } 
}

[jamesfrize]

Dude you are a Java God! Thanks again for the help.